TextWatcher for more than one EditText

Question

I want to implement the TextWatcher interface for more than one EditText fields. Currently I am using :

text1.addTextChangedListener(this);
text2.addTextChangedListener(this);

then overriding the methods in my Activity:

public void afterTextChanged(Editable s) {}

public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
public void onTextChanged(CharSequence s, int start, int before, int count) 
{
 // do some operation on text of text1 field
 // do some operation on text of text2 field 
}

However this is working fine but I'm looking for other ways so that I can explicitly identify that in which EditText field the SoftKeyboard is currently focused.

Answer 1

One more way around is to add OnClickListener to EditText and set a global variable as given below

EditText etCurrentEditor;//Global variable

@Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        if(v instanceof EditText){
            etCurrentEditor=(EditText)v;
        }
    }

Use this etCurrentEditor as a reference to currently edited EditText

@Override
    public void afterTextChanged(Editable editable) {
        // TODO Auto-generated method stub
        switch (etCurrentEditor.getId()) {
        case R.id.EDITTEXTID:
            break;
        default:
            break;
        }
    }

Answer 2

You can do this for getting the id of the edit texts. It's not tested but let me know if it works.

//setting textWatcher for the editText
textWatcher(owner_name);


public void textWatcher(final EditText editText){

    TextWatcher watcher = new TextWatcher() {
        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {

           if(editText.getId()==R.id.your_id){
             //Do something
           }   
        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
          if(editText.getId()==R.id.your_id){
          //Do something
          }
        }

        @Override
        public void afterTextChanged(Editable s) { }
    };

    editText.addTextChangedListener(watcher);
}

Answer 3

Suggested solution in @Sebastian Roth's answer is not one instance of TextWatcher for some EditTexts. It is one class and n instances of that class for n EditTexts.

Each EditText has its own Spannable. TextWatcher's events has this Spannable as s parameter. I check their hashCode (unique Id of each object). myEditText1.getText() returns that Spannable. So if the myEditText1.getText().hashCode() equals with s.hashCode() it means that s belongs to myEditText1

So if you want to have one instance of TextWatcher for some EditTexts you should use this:

private TextWatcher generalTextWatcher = new TextWatcher() {    

    @Override
    public void onTextChanged(CharSequence s, int start, int before,
            int count) {

        if (myEditText1.getText().hashCode() == s.hashCode())
        {
            myEditText1_onTextChanged(s, start, before, count);
        }
        else if (myEditText2.getText().hashCode() == s.hashCode())
        {
            myEditText2_onTextChanged(s, start, before, count);
        }
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count,
            int after) {

        if (myEditText1.getText().hashCode() == s.hashCode())
        {
            myEditText1_beforeTextChanged(s, start, count, after);
        }
        else if (myEditText2.getText().hashCode() == s.hashCode())
        {
            myEditText2_beforeTextChanged(s, start, count, after);
        }
    }

    @Override
    public void afterTextChanged(Editable s) {
        if (myEditText1.getText().hashCode() == s.hashCode())
        {
            myEditText1_afterTextChanged(s);
        }
        else if (myEditText2.getText().hashCode() == s.hashCode())
        {
            myEditText2_afterTextChanged(s);
        }
    }

};

and

myEditText1.addTextChangedListener(generalTextWatcher);
myEditText2.addTextChangedListener(generalTextWatcher);

Answer 4

Global One class for all the activities.

CustomTextWatcher.java

package org.logicbridge.freshclub.customizedItems;

import android.content.Context;
import android.text.Editable;
import android.text.TextWatcher;
    public class CustomTextWatcher implements TextWatcher {
        private EditText mEditText;
        Context context;

        public CustomTextWatcher(EditText e, Context context) {
            mEditText = e;
            this.context = context;
        }

        public void beforeTextChanged(CharSequence s, int start, int count,
                int after) {
        }

        public void onTextChanged(CharSequence s, int start, int before, int count) {
        }

        public void afterTextChanged(Editable s) {

        }
    }

Answer 5

I use this solution:

• Add method that returns listener:

  private TextWatcher getTextWatcher(final EditText editText) {
      return new TextWatcher() {
          @Override
          public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
  
          }
  
          @Override
          public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
              // do what you want with your EditText
              editText.setText("blabla");
          }
  
          @Override
          public void afterTextChanged(Editable editable) {
  
          }
      };
  }
  

• Add listener to multiple EditText's, you can also pass other parameters:

  editText1.addTextChangedListener(getTextWatcher(editText1));
  editText2.addTextChangedListener(getTextWatcher(editText2));
  editText3.addTextChangedListener(getTextWatcher(editText3));
  

Answer 6

This is what I have done...

private TextWatcher textWatcher = new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {

    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {

        if (editText1.getText().length() > 0
                && editText2.getText().length() > 0
                && editText3.getText().length() > 0) {

            button.setEnabled(true);
        } else {

            button.setEnabled(false);
        }

    }

    @Override
    public void afterTextChanged(Editable s) {

    }

Then just added the TextWatcher to each EditText in the onCreate method & also kept the button setEnabled(false) by default here.

button.setEnabled(false); 

    editText1.addTextChangedListener(textWatcher);
    editText2.addTextChangedListener(textWatcher);
    editText3.addTextChangedListener(textWatcher);